Improvement in key-guides for locks



NITED STATES LOUIS HILLEBRAND, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN KEV-GUIDES FOR LOCKS.

Specification forming part of Letters Patent No. 190,035, dated April24, 1877; application filed March 23, 1877.

I and useful Improvement in Key Guides. which improvement is fully setforth in the followin g specification and accompanying drawings, inwhich Figures 1 and 2 are views of opposite sides of the face-plate of alock having my invention applied thereto. Fig. 3 is a section in line 00m, Fig. 1. Fig. 4 is a view of parts detached. Fig. 5 is a section inline yy, Fig. 1.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention consists of a guard for a flat key, the same beiii g formedof a slotted disk, fitted in the circular opening of the face-plate ofthe lock, and clamped between two slotted disks or washers which overlapthe wall of said opening on opposite sides, the several disks beingformed of sheet metal, whereby a solid cylinder and its bearing on thelockbox or Works and cast disks are dispensed with, and a cheap, simple,and strong guide is produced.

Referring to the drawings, A represents the face-plate, which has acircular opening, B, and a slot, on, communicating therewith. 0represents a slotted sheet-metal disk, of diameter slightly less thanthe opening B, so

Thedisk 0 will be fitted in the opening B,

and the disks D D applied thereto at opposite sides, care being takenthat the slots of the several disks and the slot a communicate. Now,rivet the disks 0 D D", and they will be securely connected to theface-plate, but free to rotate, their displacement being prevented bythe disks D D overlapping the edge or wall of the opening B.

The key will be inserted in the slots, and turned, and reach thelockworks, as is evident, the three disks turning as one.

It will be seen that I use sheet metal for the several parts of thekey-guard, and dispense with a long cylinder, as heretofore employed,such cylinder occupying much space of the lock-box, and requiring abearing on said box to keep it in place, and a cheap, simple, and strongguide. is produced.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The rotary key-guide for flat keys, the same consisting of a slottedflat disk fitted in the circular opening of the face-plate of the lock,and rotatingly secured to said plate by means of disks, which overlapthe wall of said opening on opposite sides, the several disks beingformed of sheet metal, substantially as and for the purpose set forth.

JOHN A. WIEDERSHEIM, A. 1?. GRANT.

